Integrated circuit

Details Integrated circuit Integrated circuit

2007-05-08

2007-05-08

Urban, Edward (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S333000, C327S210000

Reexamination Certificate

active

10377125

ABSTRACT:
Embodiments of the present invention relates to an integrated mixer. A problem with producing low power consumption mixers is that they require a relatively high operating voltage due to the number of layers of transistor between the power rails. Accordingly, an embodiment of the present invention provides a mixer comprising first and second double balanced mixers having first and second anti-phase differential RF and LO input signals; the first double balanced mixer having a first set of four active devices each arranged to mix selected pairs of the input signals and to combine the mixed signals via first and second output nodes to produce a first portion of differential intermediate frequency output signals; the second double balanced mixer having a second set of four active devices each arranged to mix selected pairs of the input signals and to combine the mixed signals via the first and second output nodes to produce a second portion of the differential intermediate frequency output signals; the first and second portions of the output signals being combined at the first and second output nodes to produce the differential output signals.

REFERENCES:
patent: 4814649 (1989-03-01), Young
patent: 5448772 (1995-09-01), Grandfield
patent: 5767726 (1998-06-01), Wang
patent: 5826183 (1998-10-01), Apel
patent: 6073002 (2000-06-01), Peterson
patent: 6278872 (2001-08-01), Poulin et al.
patent: 6603964 (2003-08-01), Rowley et al.
patent: 6807407 (2004-10-01), Ji
patent: 6892062 (2005-05-01), Lee et al.

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